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Most paleontologists now agree that an asteroid did hit the Earth at approximately the end of the Cretaceous, but there is an ongoing dispute whether the impact was the sole cause of the extinctions. There is evidence that there was an interval of about 7012946728000000000â 300 ka from the impact to the mass extinction.
Cretaceous period (krÄ¬tÄÂ´shÉs) , third and last period of the Mesozoic era of geologic time (see Geologic Timescale, table), lasting from approximately 144 to 65 million years ago. The Cretaceous was marked, in both North America and Europe, by extensive submergences of the continents.retaceous was the third and final period of the Mesozoic Era. Cretaceous is a name derived from the Latin word for chalk, creta. Chalk is a common type of sedimentary rock formed during this interval of Earth history.